<template>
  <div>
    <ul>
      <li :style="{opacity}">欢迎学习Vue</li>
      <li>news001 <input type="text"></li>
      <li>news002 <input type="text"></li>
      <li>news003 <input type="text"></li>
    </ul>
  </div>
</template>

<script>
export default {
  name: 'News',
  data () {
    return {
      opacity: 1
    }
  },
  /* beforeDestroy () {
    console.log('News即将被销毁');
    clearInterval(this.timer)
  }, */
  /* mounted () {
    setInterval(() => {
      this.timer = this.opacity -= 0.01
      if (this.opacity <= 0) this.opacity = 1
    }, 16);
  }, */
  activated () {
    console.log('News组件被激活了');
    setInterval(() => {
      this.timer = this.opacity -= 0.01
      if (this.opacity <= 0) this.opacity = 1
    }, 16);
  },
  deactivated () {
    clearInterval(this.timer)
    console.log('News组件失活了');
  },
}
</script>

<style>
</style>